【摘要】 随着铝工业的快速扩张，铝土尾矿泥的数量不断增加。铝土尾矿中含有大量高岭石等黏土矿物，具有颗粒细小、不易固结、含水率高等特点，长期处于无承载力流塑状态，难以直接实现其综合利用，这严重制约了铝工业的绿色可持续发展。为缓解长期堆存带来的库存紧张和环境污染等问题，实现资源的高效利用，本文建立了尾矿浆实际含水率与泥水分离率之间的回归方程，并调查了直接采用尾矿浆制备泡沫轻质土的可行性。同时还研究了粉煤灰和矿渣粉对泡沫轻质土力学性能和耐久性能的影响，揭示了铝土尾矿泡沫轻质土的微观结构和水化机理。结果表明，粉煤灰与铝土尾矿间的协同效应较差，泡沫轻质土的水化程度降低，不利于其抗压强度的提高。而矿渣粉则能够显著改善泡沫轻质土的孔隙和骨架结构，提高其抗压强度。此外，矿渣粉还改善了泡沫轻质土长期水稳定性能，提高了其抗碳化性能。该研究为实现铝土矿尾矿浆的资源化利用和铝土尾矿泡沫轻质土的性能优化提供了有价值的参考，具有一定的的社会经济效益和环境效益。更多还原

【Abstract】 Bauxite tailing(BT) slurry has been generated and accumulated in large quantities, posing a threat to the green and sustainable development of the alumina industry. The regression equation between the actual water content and mudwater separation rate was established to achieve efficient resource utilization, and the feasibility of foam lightweight soil(FLS) prepared from BT was investigated. The effects of industrial waste residues(fly ash and slag powder) on the properties of FLS were studied. Meanwhile, the micro-mechanisms were revealed by XRD, SEM-EDS, and TG-DSC. The results revealed that fly ash reduced the workability and compressive strength of FLS. Slag powder can significantly enhance the compressive strength of FLS, which increased by 18.60%-23.26%, 17.07%-58.54% and 12.12%-52.12%, respectively. Besides, slag powder can improve the long-term water stability performance and enhance carbonation resistance. XRD and thermal analyses showed that adding fly ash decreased the hydration degree of FLS, leading to a decrease in the hydration products. Slag powder improved the pore structure and compacted the skeleton structure of FLS. This study would provide an effective way to realize the resource utilization of BT, fly ash, and slag powder, with certain socio-economic and environmental benefits.更多还原